The 1959-1961 Jaguar Mark IX is the last of the original 1950 Mark VII design, now with four-wheel disc brakes, power steering, and the bored-out 3.8-liter twincam engine as standard equipment. Virtually all were equipped with Borg-Warner automatic transmission. The only appearance change of note compared to the previous Mark VIII was a change in the identifying nameplate on the trunk lid.Pluses of the 1959-1961 Jaguar Mark IX: